The Holley EFI die cast aluminum four barrel throttle body is designed to fit on any square bore (4150 or 4500 style) intake manifold. It has four 1.750 throttle plates and includes the Throttle Position Sensor (TPS), Intake Air Temperature Sensor (IAT), and Idle Air Control (IAC) motor. They feature non-progressive throttle linkage, for quickest throttle response, but can be converted to progressive operation with the purchase of Holley PN 20-122.
